A demonstrator holds a sign reading “Back away slowly” to encourage other demonstrators to leave, near the Chinese Liaison Office in Hong Kong, Sunday, Aug. 18, 2019. Protesters turned Hong Kong streets into rivers of umbrellas Sunday as they marched through heavy rain from a packed park and filled a major road in the Chinese territory, where mass pro-democracy demonstrations have become a regular weekend activity this summer. (AP Photo/Vincent Thian)